To show or hide the system tray icon on SEP client machines:
Open the Symantec Endpoint Protection Manager console
Select the Clients view.
Under View Clients, select the group for which you would like to hide (or display) the shield icon.
Select Policies
Expand Location-specific Settings and select Tasks > Edit settings for Client User Interface Control Settings.
Click the Customize button for Server control.
Under the General section, disable (or enable) the Display the notification area icon option and then click OK.

Note: If your Client User Interface Control Settings are set for Mixed Control (step 6 above), you must enable the Server option for the Client User Interface Settings after following the steps above.

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